Upgrade PGP Universal Server

I need your help,
Need to update my PGP Universal Server from version 2.10 to version 10.0.2.13.
It is necessary to decrypt the disk, remove the current version and install the new version?
Or just install the new version on top and keep the existing encryption?

I am installing PGP Universal servers in two VM instances in a different subnet. (Also different physical location.) The first instance is accessible, (this will be the primary server) but the second instance is not. (This will be the secondary server in the cluster.) Also, when I restored the data from the old server to the new primary, the backup data includes the NIC configuration of the older servers, which will not work. I must use the new IP addresses in a different subnet. How to I change the NIC configuration on the new server if I can't access the console via a web interface or root now that the IP address has been changed?